Oberflächenbehandeltes Element

Details

Veröffentlichungs-Nr.

EP4772673

Anmeldetag

19. August 2024

Veröffentlichung

6. März 2025

Rechtsraum

EP

Abstract

[PROBLEM] There is provided a surface-treated member that exhibits excellent corrosion resistance even in the soil at a depth of about several centimeters from the soil surface. [SOLUTION] The surface-treated member of the present invention is formed of a surface-treated steel material including: a steel material serving as a base material; and zinc-based coatings layers, a steel base exposed portion is present in at least a portion of the zinc-based coatings layer, in a case where a cross section obtained by cutting the steel base exposed portion in the thickness direction of the steel material according to the shape of the steel base exposed portion when the zinc-based coatings layer is viewed in plan from above is observed with a microscope, at least one or more cross sections each having a steel base exposure ratio falling within a range of 1.0 to 40.0% are present, in the cross section having the steel base exposure ratio falling within a range of 1.0 to 40.0%, the shortest distance from any point on the surface of the exposed steel material to the zinc-based coatings layer is greater than 0 µm and 50.0 µm or less, and the total area of regions where a cross section having the steel base exposure ratio being greater than 40.0% is given is 5.0% or less relative to the entire area of the steel base exposed portion.

Anmelder

Firma

Nippon Steel Corporation

Land

🇯🇵 Japan